Supplemental Training Systems.

A top bodybuilding supplement line.
Josh Duhamel has been caught by People magazine jogging while wearing an STS shirt.
by Candycasa December 03, 2009
STS means Smirk to Self, it's for when a Lol is too much and a ROFL is way out of the question.

Helpful for when someone tells a joke thats not really funny but you didn't really laugh at it a STS helps you escape scot free.
Bob: Dude, my mom has AIDS
Me: STS
Me: Im sorry dude....pwnd :)
by Shane Branning May 06, 2007
Acronym for "Sucks to suck". Simply because it does suck to suck.
1: "I just got dumped and got pink-eye from a stripper in the same night"
2: "STS"
by becchalk October 15, 2010
Shoot The Shit (v) to maintain a conversation or dialogue in a friendly or casual manner
Shawn: So what was that all about?

Kris: All kinds of stuff. That girl can sts for hours!
by RratT November 26, 2013
"Sweet Tale Sir" a version of CSB.
Drew: Dude yesterday a squirrel gave me the dirtiest look so I threw my PB&J sandwich at it
Ryan: STS
by MAXDAVIDJAVI October 27, 2011
Acronym for 'Shoot That Shit'. Common among basketball players and video game nerds.
In basketball - "Dude you're wide open STS!"
In First-person Shooter - "There he is! STS!"
by Spineshank March 03, 2008
Stop Talking Shit.
X: "I heard iPhone 5 is trash.."
Y: "STS.."
by xRussian September 21, 2012
Small Town Syndrome

Living in a small town where one can keep no secrets. Yours and everyones life is the daily topic of gossip.
Person One: OMG!! So did you hear? Amanda tried to have those nasty teeth of hers corrected but the dentist said she was beyond help!

Person Two: Damn! Those teeth are moobi!! SO gross. How did you hear this?

Person One: Toti's got such hectic STS! I found out the usual way. My Aunt Sharon works at the coffee shop down the road. Well, she overheard Jade and Roxanne talking about how Jade's cousin heard Amanda's mom telling her hairdresser the whole story.
by ALS05 November 06, 2010

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